There is NO SD Card in the 2020 .. I've had the same concern and brought it to the attention of the Sales guy - who originally told me "there is an SD Card to be able to update Maps when he updates become available". When I asked him to show me WHERE the SD CARD slot was, after some feeling around the LCD Screen, he said "Oh, I guess they no longer provide that."
I am/was HOPING that MAP Updates would SOME HOW be able to be done using the USB ... but have yet to see the scheduled UPDATE & PROCEDURE on their Web Site. If we have to ALWAYS take this into the DEALER to get MAP UPDATES, I will not be a happy owner.